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CMB-S4 -- the next-generation ground-based cosmic microwave background (CMB)experiment - will significantly advance the sensitivity of CMB measurements andimprove our understanding of the origin and evolution of the universe. CMB-S4will deploy large-aperture telescopes fielding hundreds of thousands ofdetectors at millimeter wavelengths. We present the baseline optical designconcept of the large-aperture CMB-S4 telescopes, which consists of two opticalconfigurations: (i) a new off-axis, three-mirror, free-form anastigmatic designand (ii) the existing coma-corrected crossed-Dragone design. We also present anoverview of the optical configuration of the array of silicon optics camerasthat will populate the focal plane with 85 diffraction-limited optics tubescovering up to 9 degrees of field of view, up to $1.1 \, \rm mm$ in wavelength.We describe the computational optimization methods that were put in place toimplement the families of designs described here and give a brief update on thecurrent status of the design effort.

Optical design concept of the CMB-S4 large-aperture telescopes and cameras